I honestly don't think you can go much further than this. if a person has more endurance, they might do more, but without assistance I don't how much more the human form can do. of course I can't wait for humans to prove how wrong I am.
I don' think this is "speed climbing". This is climbing without being weighted down with the things that a rational person might bring (say a sleeping bag or a bivy sack). Yes is its faster because they leave that behind, but to call it "speed climbing" isn't it either. its fucking awesome, ballsy, and stupid all at the same time.
does this further climbing? yes it does.